簡易檢索 / 詳目顯示

研究生: 陳福全
論文名稱: 銀覆蓋層對鈷超薄膜在鉑(111)上的磁性影響
指導教授: 沈青嵩
學位類別: 碩士
Master
系所名稱: 物理學系
Department of Physics
論文出版年: 2001
畢業學年度: 89
語文別: 中文
論文頁數: 80
中文關鍵詞: 歐傑電子低能量電子繞射柯爾效應磁異向性
英文關鍵詞: AES, LEED, SMOKE, SRT, Co, Ag, Pt
論文種類: 學術論文
相關次數: 點閱:204下載:4
分享至:
查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報
  • 我們以自製的磁光柯爾效應儀 (SMOKE) 探測Ag超薄膜覆蓋於Co/Pt(111)樣品前後之表面磁性變化,並藉由歐傑電子能譜術 (AES) 鑑別樣品表面組成成分、計算薄膜厚度,以及低能量繞射電子儀 (LEED) 研究表面結構,升降溫系統與離子濺射進行退火效應與深度分析的實驗。
    我們發現在1ML及2ML Co/Pt(111)其樣品磁化易軸在垂直樣品表面方向,近1ML的Ag覆蓋會增強矯頑力HC達到最大的幅度。而1ML Ag/1ML Co/Pt (111)經650K退火後,因Co-Pt合金的形成,室溫下polar方向的柯爾訊號增至退火前200%,但經710K退火的樣品則因室溫325K時HC大於外加磁場而量測不到柯爾訊號。至於1ML Ag/2.2ML Co/Pt (111)磁性變化則與1ML Ag/1ML Co/Pt(111)相類似,但因Co厚度增加使得居禮溫度由後者之710K提高至780K,此外室溫325時之HC尚小於外加磁場,故可量測到柯爾訊號。
    3ML Co/Pt(111)則因Co薄膜呈三維島狀成長,使樣品磁化易軸提前轉為平行樣品表面的方向,但經1ML的Ag覆蓋後,產生spin reorientation transition (SRT)的現象,磁化易軸轉為垂直樣品表面的方向;同樣的現象在4ML Co/Pt(111)及5ML Co/Pt(111)中發現,並經由深度分析確定SRT的產生機制來自Ag覆蓋層的影響。同時我們也觀察Ag覆蓋後樣品升降溫過程的磁性變化,並在論文討論之。
    而8ML Co/Pt(111)則在Ag覆蓋厚度達1.5ML層時,才量測到polar方向的柯爾訊號,我們推測Ag覆蓋層達1ML時已增強垂直磁異向性,只是HC大於外加磁場而量測不到訊號,隨著Ag覆蓋層厚度增加HC減小而測得柯爾訊號。此外我們並不確定是Ag-Co介面或者是量子效應干涉造成這樣的現象,值得再深入研究。

    Chapter 1 緒論……………………………………………………………….1 Chapter 2 基本原理 2-1 薄膜成長…………………………………..…………………………….3 2-1-1成長模式…………………………………………………………..4 2-1-2 影響薄膜成長的因素…………………………………………….4 2-2 磁性物質………………………………………………………………5 2-2-1磁性物質…………………………………………………………..5 2-2-2 鐵磁性物質……………………………………………………….7 2-2-3 居禮溫度………………………………………………………….8 2-3 磁異向性…………………………………………………………………8 2-3-1磁異向能…………………………………………………………..9 2-3-2影響磁異向性的因素……………………………………………..9 Chapter 3 實驗原理與儀器 3-1 超高真空系統…………………………………………………………..13 3-1-1 真空理論………………………………………………………...13 3-1-2 超高真空腔與抽氣系統………………………………………...15 3-1-3 樣品清潔與升降溫系統………………………………………...18 3-1-4蒸鍍系統…………………………………………………………20 3-1-5 其他系統………………………………………………………...21 3-2 歐傑電子能譜術………………………………………………………..21 3-2-1 歐傑效應………………………………………………………...21 3-2-2 歐傑電子能譜…………………………………………………...23 3-2-3 阻滯電場分析儀………………………………………………...24 3-2-4 歐傑電子能譜術之應用………………………………………...26 3-3 歐傑訊號計算薄膜厚度………………………………………………..28 3-3-1 歐傑訊號計算薄膜厚度………………………………………...28 3-3-2 平均自由徑的計算……………………………………………...29 3-3-3 back-scattering terms 的計算……………………………………31 3-3-4 cosθ的計算……………………………………………………...31 3-3-5薄膜厚度之計算…………………………………………………32 3-4 低能量電子繞射儀……………………………………………………..36 3-4-1 LEED之基本原理……………………………………………….37 3-4-2 RFA-LEED工作原理……………………………………………38 3-5 磁光柯爾效應…………………………………………………………..39 3-5-1磁光柯爾效應……………………………………………………39 3-5-2 SMOKE及測量原理…………………………………………………….40 3-5-3 表面磁光柯爾效應儀的元件…………………………………………42 Chapter 4 實驗結果與討論 4-1 樣品準備………………………………………………………………..44 4-2 1ML Ag/1ML Co/Pt (111) 的磁性探………………………………...45 4-3 1ML Ag/2.2ML Co/Pt (111) 的磁性探測……………………………54 4-4 1ML Ag/3ML Ag/Pt (111) 的磁性探………………………………...58 4-5 1.5ML Ag/4ML Co/Pt (111) 的磁性探測……………………………61 4-6 1ML Ag/5ML Co/Pt (111) 的磁性探………………………………...66 4-7 2ML Ag/8ML Co/Pt (111) 的磁性探………………………………...72 Chapter 5 結論…………………………………………………………...74 參考資料…………………………………………………………………….76

    [1] D. Lambeth, in: G.C. Gadjipanayis (Ed.), Magnetic Hysteresis in Novel Magnetic Materials, NATO ASI Series E 338, 767 (1997)
    [2] Rugian Wu, Chun Li and A. J. Freeman, J. Magn. Magn. Mater. 99,71 (1991)
    [3] P. F. Caraia, J. Appl. Phys. 63, 5066 (1988)
    [4] W. B. Zeper, F. J. A. M. Greidanus, P. F. Carcia and C. R. Fincher, J. Appl. Phys., 65, 4971 (1989)
    [5] Sang-Koog Kim, Vladimir A. Chernov, Yang-Mo Koo, J. Magn. Magn. Mater. 170, L7 (1997)
    [6] Allenspach, R., Stampanoni, M. and Bischof, A., Phys. Rev. Lett., 65, 3344 (1990)
    [7] C. Chappert and P. Bruno, J. Appl. Phys. 64 (10), 5736 (1988)
    [8] A. Kirilyuk, J. Ferré, V. Grolier, J. P. Jamet., D. Renard, J. Magn. Magn. Mater. 171, 45 (1997)
    [9] N. C. Koon and B. T. Jonker, Phys. Rev. Lett., 59, 2463 (1987)
    [10] S. Hashimoto, Y. Ochiai, and K. Aso, J. Appl. Phys. 66 (10), 4909 (1989)
    [11] R. Atkinson, S. Pahirathan, I. W. Salter, P. J. Grundy, C. J. Tatnall, J. C. Lodder, Q. Meng, J. Magn. Magn. Mater. 162, 131 (1996)
    [12] S. Hashimoto and Y. Ochiai, J. Magn. Magn. Mater. 88, 211 (1990)
    [13] Jin-Hong Kim, Sung-Chul Shin, Jpn. J. Appl. Phys. 35, 342 (1996)
    [14] G. Zangari, P. Bucher, N. Lecis, P.L. Cavallotti, L. Callegaro, E. Puppin, J. Magn. Magn. Mater. 157/158, 256 (1996)
    [15] S. Yoshii and K. Egashira, IEEE Trans., MAG-10, 584 (1974)
    [16] C. S. Shern, J. S. Tsay, H. Y. Her, Y. E. Wu and R. H. Chen, Surf. Sci. Lett., 429, L497 (1999)
    [17] J. S. Tsay and C. S. Shern, J. Appl. Phys., 80, 3777 (1996)
    [18] J. S. Tsay and C. S. Shern, Surf. Sci., 396, 313 (1998)
    [19] J. S. Tsay and C. S. Shern, Surf. Sci., 396, 319 (1998)
    [20] C. S. Shern, S. L. Chen, J. S. Tsay, and R. H. Chen, Phys. Rev. B, 58, 7328 (1998)
    [21] C. S. Shern, J. S. Tsay, S. L. Chen, and Y. E. Wu, J. Appl. Phys., 85, 228 (1999)
    [22] J. Ferré, J. P. Jamet, J. Pommier, P. Beauvillain, C. Chappert, R. Mégy, P.Veillet, J. Magn. Magn. Mater. 174, 77 (1997)
    [23] L. Argile and G.E. Rhead, Surf. Sci. Rep. 10, 277 (1989)
    [24] E. Bauer, Appl. Surf. Sci. 11/12, 479 (1982)
    [25] 蔡萍實,國立台灣師範大學碩士論文 (1992)
    [26] B. Dodson, Phys. Rev. B, 36, 6288 (1987)
    [27] R. Shimizu, Jap. J. Appl. Phys., 22, 1631 (1983)
    [28] S. D. Bader, J. Magn. Magn. Mater. 100, 440 (1991)
    [29] E. T. Kulatov, Yu. A. Uspenskii, S. V. Halilov, J. Magn. Magn. Mater., 163, 331 (1996)
    [30] B. Heinrich and J. A. C. Bland “Ultrathin Magnetic structures Ⅰ” Ch2
    [31] 張喣,李學養,磁性物理學,Ch6 (1982)
    [32] R. Lawerence Comstock, “Introduction to Magnetism and magnetic Recording” (1999)
    [33] Ching-Ray Chang and D. R. Fredkin, J. Appl. Physw., 63, 3435 (1988)
    [34] J. A. C Bland, B. Heinrich(Eds), “Ultrathin Magnetic Structures Ⅰ”, 66-68 (1994)
    [35] H. J. G. Draaisma, W. J. M. de Jonge, J. Appl. Phys. 64, 3610 (1988)
    [36] L. Neel, J. de Phys. Et le Rad. 15, 225 (1954)
    [37] G. Etrl, J. Küppers, “Low Energy Electrons and Surface Chemistry” (1985)
    [38] D. Chattarji, “The Theory of Auger Transitions”, London: Academic Press (1976)
    [39] D. L. Walters and C. P. Bhalla, Phys. Rev, A3, 1919 (1971)
    [40] D. Briggs and M. P. Seah, “Practical Surface Analysis 2nd “ (1990)
    [41] M. P. Seah, J. Vac. Sci. Technol., 17, 16 (1980)
    [42] Lawerence E. Davis, Noel C. MacDonald, Paul W. Palmberg, Gerald E. Riach and Roland E. Weber, “Handbook of Auger Electron Spectroscopy”, (1978)
    [43] C. J. Powell, J. Electron Spectrosc., 47, 197 (1988)
    [44] A. Jablonski and H. Ebel, Surf. Interface Anal., 11, 627 (1988)
    [45] C. J. Powell, Surf. Sci., 299/300, 34 (1994)
    [46] S. Tanuma, C. J. Powell and D. R. Penn, J. Vac. Sci. Technol. A, 8, 2213 (1990)
    [47] S. Tanuma, C. J. Powell and D. R. Penn, Surf. Interface Anal., 20, 77 (1993)
    [48] S. Ichimura and R. Shimizu, Surf. Sci., 112, 386 (1981)
    [49] J. A. Bearden and A. F. Burr, Rev. Mod. Phys., 39, 125 (1967)
    [50] M. P. Seah, /surf. Sci., 32, 703 (1972)
    [51] 潘扶民,儀器總覽—表面分析儀器,1 (1998)
    [52] Charles Kittel, “Introduction to Solid State Physics” (1991)
    [53] 盧治權,儀器總覽—表面分析儀器,50 (1998)
    [54] Z. Q. Qiu, J. Pearson and S.D. Bader, Phys. Rev. B. 45, 7211 (1992)
    [55] P. Grutter, U. T. Barrett, R. Belkhou, C. Guillot and H. Koundi, J. Phys. condens. matter (1994)
    [56] J. S. Tsay and C. S. Shern, Chinese Journal of Physics, 34, No.2-Ⅰ
    [57] H. Roder, R. Schuster, H. Brune, and K. Kem, Phys. Rev. Lett. 71, 2086 (1993)
    [58] R. Schuster, H. Roder, H. Brune, and K. Kem, Phys. Rev. B 54, 13476 (1996)
    [59] V. Grolier, J. Ferré, A. Maziewskl, E. Stefanowicz, and D. Renard, J. Appl. Phys., 73, 5939 (1993)
    [60] C. Train, R. Mégy, C. Chappert, J. Magn. Magn. Mater., 202, 321 (1999)
    [61] Tsu-Yi Fu, T. F. Liu, C. W. Su, C. S. Shern, R. H. Chen, Surf. Sci., 464, 211 (2000)
    [62] Brad N. Engel, Michael H. Wiedmann, Robert A. Van Leeuwen, and Charles M. Falco, J. Appl. Phys., 73, 6192 (1993)
    [63] Y. J. Chen, T. Suzuki, S. P. Wong and H. Sang, J. Appl. Phys., 85, 5048 (1999)
    [64] S. Honda, M. Nawate, M. Tanaka and T. Okada, J. Appl. Phys., 82, 764 (1997)
    [65] H. Brandle, D. Weller, J.C. Scott, S.S.P. Parkin, C. –J. Lin, IEEE Trans. Magn. 28, 2967 (1992)
    [66] W.J.M. de Jonge, P.J.H. Bloemen, F.J.A. den Broeder, in: J.A.C. Bland, B. Heinrich (Eds.), Ultrathin Magnetic Structures I, Springer, Berlin, 1994, and references cited therein
    [67] U. Bovensiepen, Hyuk J. Choi, Z. Q. Qiu, phys. Rev. B, 61, 3235 (2000)
    [68] A. Berger and H. Hopster, Phys. Rev. Lett. 76, 519 (1996); J. Appl. Phys. 79, 5619 (1996)
    [69] G. Garreau, M. Farle, E. Beaurepaire, J.P. Kappler, J. Magn. Magn. Mater. 184, 289 (1998)
    [70] M. Farle, B. Mirwald-Schulz, A. N. Anisimov, W. Platow, and K. Baberschke, Phys. Rev. B 55, 3708 (1997)
    [71] W. Weber, C.H. Back, A. Bischof, D. Pescia, R. Allenspach, Nature 374, 788 (1995)
    [72] W. Weber, C.H. Back, U. Ramsperger, A. Vaterlaus, R. Allenspach, Phys. Rev. B 48, R14400 (1995)
    [73] S. Hope, E. Gu, B. Choi, J.A.C. Bland, Phys. Rev. Lerr. 80, 1750 (1998)
    [74] Brad N. Engel, Michael H. Wiedmann, Rovert A. Van Leeuwen, and Charles M. Falco, Phys. Rev. B, 48, 9894 (1993)
    [75] P. Beauvillain, A. Bounouh, C. Chappert, R. Megy, S. Ould-Mahfoud, J. P. Renard, P. Veillet, D. Weller, and J. Corno, J. Appl. Phys. 76, 6078 (1994)
    [76] J. E. Ortega, F. J. Himpsel, G. J. Mankey, and R. F. Willis, Phys. Rev. B, 47, 1540 (1993)
    [77] D. Hartmann, W. Weber, A. Rampe, S. Popovic, and G. Guntherodt, Phys. Rev. B, 48, 16837 (1993)

    QR CODE